Vick, younger brother of Atlanta Falcons star Michael Vick, went undrafted this year after off the field trouble at Virginia Tech.
"I want to make it very clear that we will not condone any behavior issues in the future relative to Marcus Vick," said Dolphins Coach Nick Saban. "Marcus acknowledges that he has made some mistakes, all of which has resulted in severe consequences for him. They have helped him learn that he will need to make much better choices and decisions in the future or risk similar consequences that could jeopardize his career as a professional player."
Marcus Vick played two seasons at Virginia Tech (2003, 2005) and completed 207 of 346 passes for 2,868 yards with 19 touchdowns. Last season, he connected on 177 of 289 passes for 2,393 yards with 17 touchdowns while leading the Hokies to an 11-2 record.